Machine for making paper bags



L. 'W. WELSFORD. MACHlNE FOR MAKING PAPER BAGS.

APPLICATION FILED JULY 8, I920.

Patented Dec. 20, 1921.

3 SHEETS-SHEET 2 L. w. WELSFORD.

MACHINE FOR MAKING PAPER BAGS.

APPLICATION FILED JULY 8, I920.

Patented D00. 20; 1921.

3 SHEETS-SHEET 3.

warren stares .PTENT QFFICE.

LESLIE WELSFGED, OF VICTORIA, AUSTRALIA, ASSIGNOR T0 JAMES CLASON GATES, llliFl-LBG'UENE, VICTORIA, AUSTRALIA.

MACHINE "FOR MAKING PAPER BAGS.

Specification of Letters Patent.

Patented Dec. 20, 1921.

Application filed July 8, 1920. Serial No. 394,651.

To aZZ whom it may concern.

Be it known that LESLIE VTAL'rnn Wnns noun, a citizen of the Commonwealth of tralia, and resident of 266 Post Office Flace, Melbourne, in the State of Victoria, k/OHb monwealth of Australia has invented certain new and useful Improvements in and Relating to Machines for Making Paper Bags, of which the following is a specifica tion.

This invention relates to improvements in machines for making paper block bottom bags of the type commonly employed in the parceling of foodstuffs and the like.

The invention has been devised in order to provide improvements in structural elements and mechanical movements whereby output is increased greater reliability in operation is insured, and liability of tearing of the paper at certain periods of the ordinary process of manufacture is obviated.

The invention more particularly has reference to machines for the manufacture of paper bags having at the sides longitudinal. seams and at the bottoms diamond folds furnished with thumb bits and wherein said seams and thumb bits are secured by the use of an adhesive.

In order that the invention may be more readily understood it will now be described with reference to the accompanying drawings in which Figure 1 is a side elevation, and

Fig. 2 is a plan of the improved machine.

Fig. 3 is a view illustrating the driving gear.

Fig. 4C is a view in perspective illustrating the spring fork or tongue adapted to hold the bag blank open to facilitate the operation of the diamond folder.

Fig. 5 is a side elevation of the gumming roller.

Fig. 6 is a view of the position of the rollers and guiding members employed in the formation of a bag.

Fig. 7 shows the first position of the diamond fold with the thumb bits formed thereon. I

Fig. 8 shows the second position of the diamond fold, and

Fig. 9 illustrates fold.

Figs. 10 and 11 are sectional and end ele the finished diamond vations respectively of the cutting and creasing rollers.

Figs. 12 and 13 are views illustrating the bearings of the paper roll undercarriage.

Fig. 14- is a view illustrating the ball bean ing bracket for the upper rollers.

Fig. 15 is a view in plan partly in section. of one of the paper supporting rollers.

Figs. 16 and 17 are views in plan and elevation respectively of the guide rollers to enable the paper to be folded around the templet.

Figs. 18 and 19 are views illustrating the bearings for the train of rollers on the machine.

Fig. 20 is a view in perspective of the preferred form of knife employed for parting the bag blank from the paper roll.

Fig. 21 shows enlarged cross-sectional views of two creasing the machine.

According to this invention a strong .2 r iramework 1 1s p1 ovided. Rotatably mount ed in bearings 2 fitted below one end of the frame are spindles 3 supporting rollers 4.- with fixed or adjustable flanges 5 and disposed around these rollers 1 is a belt 6 which forms a support for the paper roll 7 and at the same time gives a braking effect.

The paper strip 8 from the paper roll 7 passes around the guiding roller 9 and then around a further roller 11 where it comes into contact with a spring operated paste roller 12 working in a paste box 13. The paste roller 12 is held up against the paper by means of an arm 14- connected to the spindle of the roller and which is under the pull of a spring 15.

The paper strip 8 is then drawn upon the templet 16 around which it is manually rollers employed in to be swung out of the way when first threading the paper on the templet 16 and when they are in position against the paper and particularly it slightly canted they tend to draw the paper into shape around the templet 16 while ifthere are any cuts on the paper, the said rollers 17 moving in the direction of the paper allow-of free movement and at the same time effectively guide the paper along the templet 16 and the paper leaves the latter in the form of a folded strip 7 or tube.

Forwardly of the end of the templet 16 are two superposed rollers 21, 22 and the folded paper passing between them is caused to be drawn between creasing and cutting rollers 23, 24.v The top roller 23 is formed with the male ridge 25-while the lower roller 24 is formed with the female groove 26, the

' crease thus formed being shown by the dot ted lines 27 Fig.

These rollers are also formed with angular grooves28, 29 the lower roller 24 being formed with the male ridge 23 and the top roller 23 being formed with the female groove 29 so forming the diagonal creases 30 in'the bag blank as illustrated in Fig. T.

These rollers 23, 24 are also provided with parting knives 31, 32 illustrated more particularly in Figs. 11 and 20 and which are arranged to cut olffrom the advancing folded strip 3 a length suiiicient to form a bag, the cutting member 31 on the top roller 23 being adapted to engage the edge of the cutting member 32 of the lower roller 24. These cutters 31, 32 are formed with serrated surfaces 32 the teeth 32 being adapted to pass within the recesses 32 at the meeting edges of the knives 31, 32 and so cut the bag blank from the strip '8 and with a finished serrated edge.

It will be obvious that the cutting teeth of the knives 31, 32 may be formed in any to pass therethrough so that when the cutting knives are in operation said rod is pressed upwardly into the grooves 33,

, such operationforming the thumb bits 34 at the proper time and position.

'The forkedrod or tongue 35 is ailixed to the templet 16' and extends forwardly therefrom through central recesses or grooves 36 in the drawing rollers 21, 22 and through ,similar grooves in the parting rollers 23, 24 and through the grooves p in the knife 31.

The spring tongue or fork member is provided with upwardly curved teeth 37 di:-'

posed immediately forwardly of the con tact point of the parting rollers 23, 24 while a hook member 38 extends downwardly from a support 39 connected to the frame immediately behind the teeth 37, so that as the bag is drawn through, the top portion of the paper is brought into engage ment with the hook 33 which folds the paper back into the position shown in Fig. 7. The bag then moves forwardly below the guiding tongue 40 which completes the fold as illustrated in Fig. 7 and which passes within the cut or slit portion 35 see Fig. 7 andguides the bag blank between the rollers grooved as at 43 and is provided with projections 44 at the grooved surface, which projections 44 contact with a roller 45 re ceiving paste from the paste box 46, and these members 44paste the'edges 47 of the bottom of the. paper fold as'illustrated in Fig. 7. Simultaneously, the bottom of the bag is creased as at 48, Figs. 8 and 9, bythe male ridges 49 on the top roller 41, and

the female grooves 5(1 on the lower roller 42.

As the bag end passes through the rollers 41, 42, it is engaged by the member 1510f the hook52 connected to the frame and the portion 53 of the'diamond fold is turned back and pasted down as illustrated in F ig. 8. The bag blank is then passed to the rollers 54, 55 where the bifurcated end 56 of the hook 57 supportedon the frame folds the bag end backand on passing to the The .top roller 41 is centrally V rollers 58, 59 the bag end having. a certain amount of flexible sorinv or movement the end is folded over 011 theline or crease 48" knotted cord 63, arranged around pulleys 64, 65 and driven bysprocket and chain gear 66, from the spindle 67 of the upper finishing roller 61, which receives motionby spur gearing from the spindle 68 of the lower finishing roller62.

This lower roller 62 is operated by a belt 69 from the spindle 7010f the lower roller 54 and the belt 69 carrying the bagfforwardly and traveling at a lower speed than they knotted cord 63 allows the bag end to be engagedby the knot 71 of the cord which flattens the diamond fold {out in its proper position preparatory to passing through the.

finishing rollers 61 and 62 which are preferably flattened at the point where they meet the bag passes therethrough.

The driving gear has motion imparted Cir 1 ,aoassv thereto from the belt pulleys 72 on the spindle 73 of the roller 58 and a chain 74 gears with a sprocket on the spindle 7 3 and engages sprockets on the lower rollers 22, 24, 42, 54 and 58. The upper roller 23 is connected by spur gears with the lower roller 24, and the upper roller 41 is connected by spur gears with the lower roller 42, while the upper rollers 55, 59, 61 have similar gear connections with the lower rollers 54, 58 and 62 respectively, the drawing-in rollers 21 and 22 being the only rollers in frictional engagement with each other. l3etween the rollers 23, 24 and the rollers 41, 42 is a supporting plate which supports the paper tube and a further supporting plate 76 is arranged between the rollers 41, and the rollers 55, 54, the bag after it leaves the rollers 54, 55 being supported by the belt 69 which is arranged centrally of the rollers.

-All the upper rollers are adjustably mounted as illustrated more particularly in Figs. 18 and 19, the upper bearing block 77 of each upper roller being provided with a ball race 78 and ball bearings 79 to support the roller and being adjusted at the required pressure under the compression of the springs arranged around the rods extending into the corresponding lower hearing block 91. The spindles of the lower rollers are mounted in cup and ball bearings 92 as illustrated more particularly in Fig. 19.

I desire it to be understood that the hooks 38, 52 and 57 may be mounted and arranged in any suitable way without departing from the spirit and scope of the invention provided they are adapted to perform the functions above described.

In the operation of the machine, the strip 8 is led from the roll 7 and passed around the roller 11 where it is gummed by the roll-er 12. It is then passed over the term plot and folded around the same, is drawn between the guiding pulleys 17, through the friction drawing rollers 21, 22 and through the slitting and cutting rollers 23, 24 where the first portion of the diamond fold and the thumb bits 34 are formed as illustrated in Fig. 7. The bag blank is then passed between the rollers 41, 42, where the edges 47 are gummed, the creases 48 and 48 are formed and the end 53 turned over and gummed down.

The bag blank is then passed between the rollers 54, 55 and by means of the bifurcated end 56 of the hook 57 is folded back on the crease 48 and the end 60 is gummed down to produce the position and folds indicated in Fig. 9.

After passing the rollers 58 and 59 the bag is flattened out in the proper position with the diamond fold upwardly by having been engaged by the knot 71 of the cord 63 preparatory to passing through the finishing rollers 61 and 62.

An apparatus constructed and arranged as above described will be of great utility and simple and effective in operation as the bag is not given any serious obstruction owing to the fact that it is passed in an approximately straight line through the machine from the templet to the finishing roll.

What I claim as my invention and desire to secure by Letters Patent is- 1. A machine of the class described comprising in combination a supporting belt, a paper roll, guide rollers, a pasting roller, a templet, adjustable guiding rollers, drawing-in rollers, rollers adapted to part the bag blank and crease the same, parting knives mounted on the lastnamed rollers, a flexible rod having a projection thereon, a hook, a guide tongue, a supporting plate, creasing and folding rollers, a paste roller associated therewith, a paste box, folding rollers in advance of the first-named folding rollers, a hook having a bifurcated end, folding rollers in advance of the secondnamed folding rollers, a belt, a knotted endless cord, and finishing rollers, the various rollers being arranged in pairs one above the other with the several pairs disposed in line along the length of the machine.

2. In a paper bag machine, the combination of a pair of superposed rollers; a pair of knives mounted longitudinally on said rollers for coaction with each other, the knife on the upper roller having a groove in its edge; and a flexible tongue extending between said rollers in the vertical plane of said groove and adapted to be pressed upwardly in the groove during the coaction of the knives, so as to form thumb bits on the bag blank. 7

3. In a paper bag machine, the combination of a pair of superposed drawing-in rollers; a pair of superposed cutting rollers located directly in advance thereof, the upper rollers of both pairs having alining circumferential recesses; a pair of knives mounted longitudinally on the cutting rollers for coaction with each other, the knife on the upper roller having a groove in its edge which is located within the recess in that roller; and a flexible tongue extending be tween said rollers and through the recesses in the vertical plane of the groove in said knife and adapted to be pressed upwardly in the groove during the coaction of the knives, so as to form thumb bits on the bag blank.

4. In a paper bag machine, the combination of a pair of superposed rollers; a pair of knives mounted longitudinally on said rollers for coaction with each other, the knife on the upper roller having a pair of spaced grooves in its edge; and a flexible rod having a forked end which extends between said rollers and the arms of which are disposed in the vertical planes of said grooves,

so that said arms will be pressed upwardly in the grooves during the coaction of the knives, in order to form thumb bits on the bag blank.

5. In a paper bag machine, the combina tion of a pair of coacting rollers, one having both a longitudinal ridge and a diagonal ridge, and the. other having a longitudinal groove and a diagonal groove to respectively receive the same; a. pair of knives mounted longitudinally on said rollers for coaction with each other, the knife on the upper 

